Yes, there are some, her is a list of the Business Rules Editor shortcuts we know about. This list might not be complete.
| Ctrl+L | Deletes the current line |
| Ctrl+C | If nothing is selected duplicates the current line |
| Ctrl+] | Find the matching close parenthesis and moves the cursor to the end or beginning.  |
| Shift+Ctrl+] | Selects the whole string between matching parenthesis and moves the cursor to the end or beginning. |
| Ctrl+Space | Shows the Intellisense window for that specific item (use when you want to see Intellisense, of course after you lost it 😊). |
| Space | Autofill from the Intellisense when you are in Intellisense window. |
| Ctrl+U | Change to lowercase |
| Shift+Ctrl+U | Change to Uppercase |
| Ctrl+M | Collapses all collapsible regions |
| Ctrl++ | selects the full word, the full line, the full block … (always one step larger) |
| Ctrl+- | deselects the full word, the full line, the full block … (always one step smaller) |
| Alt+<cursor up> | Moves a selected block one line up |
| Alt+<cursor down> | Moves a selected block one line up |
| Ctrl+t | Switches the char left and right from the cursor |
| Shift+ Ctrl+t | Switches the words left and right from the cursor |
| Ctrl+i | Instantaneous searches forward while typing a word |
| Shift+ Ctrl+i | Instantaneous searches backward while typing a word |
If you find additional shortcuts, please reply to this post, I will add them to the list.